Update to drupal 8.0.0-rc1. For more information, see https://www.drupal.org/node/2582663

vendor/symfony/console/Tests/Fixtures/Foo3Command.php

@@ -0,0 +1,29 @@
+<?php
+
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+class Foo3Command extends Command
+{
+    protected function configure()
+    {
+        $this
+            ->setName('foo3:bar')
+            ->setDescription('The foo3:bar command')
+        ;
+    }
+
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        try {
+            try {
+                throw new \Exception('First exception <p>this is html</p>');
+            } catch (\Exception $e) {
+                throw new \Exception('Second exception <comment>comment</comment>', 0, $e);
+            }
+        } catch (\Exception $e) {
+            throw new \Exception('Third exception <fg=blue;bg=red>comment</>', 0, $e);
+        }
+    }
+}